from a passer by to a acquaintance.
from a acquaintance to a friend.
from a friend to a close friend.
from a close friend to a best friend.

then...

from a best friend to a close friend.
from a close friend to a friend.
from a friend to a acquaintance.
from a acquaintance to a passer by.

how long does each process takes?

i try to be a very good friend. but maybe i'm just not good enough?

nevertheless, i'm still glad with the few ones i have currently. less is more remember?